Stop Checking. Start Sleeping.
Five reasons seed starters who've spent too many nights in a bathrobe at the greenhouse door are switching to a heater that does the checking for them — and wake up to the same green trays they left.
You Know the Night. The Forecast Says 28°F and You Don't Sleep.
The seeds went in back in February. You've been under the grow light with them for weeks, potting up, turning trays, watching true leaves come in. Then the forecast drops, and that's it for sleep.
You set an alarm for 2. Or you don't bother, because you're lying there anyway, running the numbers on the greenhouse. Is the heater still going? Is it enough? Is the far bench colder than the near one?
It isn't the cold that keeps you up. It's not knowing. And nothing in that greenhouse can tell you, because the heater you've got doesn't know either.
The 2am Check Feels Like Doing Something. It Mostly Isn't.
Robe, slippers, flashlight, the walk across the frosty lawn. You open the door, look at the trays, put a hand near the heater, and go back to bed. Maybe you turn the knob up a notch on the way out.
Here's the hard truth: the knob doesn't have a temperature on it. It goes from MIN to MAX. Turning it up just makes it run harder until you walk out and turn it down again. And the coldest hour usually comes after you've gone back to bed, right before sunrise.
So the check doesn't protect the seedlings. It just costs you the night. What the trays need is something that watches the temperature at 3, at 4, at 5:30, and does something about it every time.
FrostGuard Does the Checking. All Night, Every Few Seconds.
FrostGuard ships with a digital thermostat and a probe on a cable. Push the probe into the soil beside your seedlings. Set 45°F. Go to bed. Here's your night now:
| Time | Greenhouse | You |
|---|---|---|
| 10 pm | Probe reads 48. Heater off, waiting. | Reading in bed. |
| 1 am | Drops below 45. Heater fires, full heat in seconds. | Asleep. |
| 1:20 am | Back to 45. Shuts off. | Asleep. |
| 5 am | Coldest hour. Fires again, as often as it takes. | Asleep. |
| 7 am | Sun's up. Heater rests. | Coffee. |
Every check you used to make at 2am, it makes every few seconds, at the height of the seedlings, and it acts on what it finds. Set it once. Sleep through the frost.
Same Frost. A Very Different Morning.
Every seed starter has a version of this tray. The tag says February. The leaves are black and glassy. It took one night, and the heater was on the whole time.
That tray isn't six weeks of work. It's the whole season it was going to become: the tomatoes you'd have been picking in July, the peppers you'd have shared, the varieties you can't buy as plants. You can't restart February in April.
Now picture the same frost, with a probe in that tray and a thermostat holding 45. You walk out at 7 with coffee instead of at 2 with a flashlight, and the trays look exactly like you left them. That's the whole difference, and it costs less than one season of starts.
$79.95, Thermostat Included. Runs Only While It Needs To.
$79.95 during the Fall Sale, down from $159.90, with free shipping. In the box: the 1500W PTC ceramic heater with its fan / 800W / 1500W knob and tilt stand, the digital thermostat controller, the probe on its cable, and the manual.
Because it only runs while the probe reads below your number, a typical frost night is a few hours of actual heat, not eight. On 800W that's roughly 14¢ an hour at the US average electric rate. Overheat protection, steel body, ETL listed, no flame, nothing to refill.
Sized honestly: it's made for a small hobby greenhouse, a lean-to, a sunroom or a grow tent. A bigger or single-wall space needs two units, two probes, two numbers.
A 1500W PTC ceramic greenhouse heater that ships with a digital thermostat and probe. It reads the temperature beside your seedlings all night and holds the number you set, so the only time you walk out to the greenhouse is when you want to.
Why 50% off? It's our Fall Sale, priced for growers who want the probe placed and the number set before the first frost warning, not the night of it.
$79.95 during the Fall Sale, half off with free shipping and 30 nights to change your mind. A probe beside your seedlings, a number you set once, and a heater that checks all night so you don't have to.
Get FrostGuard — 50% Off →